题型:选择题 The mother always tells her children _____ their homework carefully. [ ]A. do B. didC. doing D. to do 查看答案
题型:单项选择题 小儿各年龄分期,正确的是()A.围产期,生后脐带结扎至生后7天B.新生儿期,生后脐带结扎至生后56天C.婴儿期,生后至满2岁之前D.幼儿期,生后满1岁至满3岁之前E.学龄前期,生后5岁至满7岁之前 查看答案